(Credit Facility) (Details)			3 Months Ended					12 Months Ended
	Feb. 08, 2017 USD ($)	Nov. 04, 2016 USD ($)	Jul. 03, 2018	Jan. 02, 2018	Oct. 03, 2017	Jul. 04, 2017	Jan. 03, 2017 USD ($)	Jan. 03, 2017 USD ($)	Dec. 29, 2015 USD ($)	Dec. 30, 2014 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 100,000,000.0	$ 100,000,000.0
Remaining borrowing capacity							11,900,000	11,900,000
Amount outstanding							85,400,000.0	85,400,000.0
Letters of credit outstanding							2,700,000	2,700,000
Growth capital expenditures							4,000,000.0
Growth capital expenditures thereafter							10,000,000.0
Interest Expense								2,916,000	$ 1,432,000	$ 365,000
Amortization of debt issuance costs							$ 100,000	$ 100,000	$ 100,000	$ 100,000
Minimum
Line of Credit Facility [Line Items]
Commitment fee on unused portion of facility		0.30%
Credit facility interest range								2.49%
Maximum
Line of Credit Facility [Line Items]
Commitment fee on unused portion of facility		0.50%
Credit facility interest range								5.75%
Secondary Rates [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.00%
Secondary Rates [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate		3.00%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
London interbank rate (LIBOR)							LIBOR
Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.50%
Two Thousand Sixteen Credit Facility [Member]
Line of Credit Facility [Line Items]
Quarterly amortization payments		$ 2,500,000
Costs associated with thermination of leases (up to)		1,500,000
Pro forma general and administrative cost savings (up to)		2,700,000
Liquidity amount in covenant ratio (at least)		$ 10,000,000.0
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 15,000,000.0
Gross purchase amount on equity securities (at least)	$ 45,000,000
Subsequent Event [Member] | Minimum
Line of Credit Facility [Line Items]
Commitment fee on unused portion of facility	0.30%
Subsequent Event [Member] | Maximum
Line of Credit Facility [Line Items]
Commitment fee on unused portion of facility	0.50%
Subsequent Event [Member] | Secondary Rates [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Subsequent Event [Member] | Secondary Rates [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.00%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.25%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
London interbank rate (LIBOR)	LIBOR
Subsequent Event [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Subsequent Event [Member] | Two Thousand Sixteen Credit Facility [Member]
Line of Credit Facility [Line Items]
Quarterly amortization payments	$ 2,500,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum leverage ratio		5.50
Minimum fixed Charge leverage ratio, upper limit		1.50
Minimum fixed charge leverage ratio, lower limit							1.15
Negative covenant ratio		5.00
Line of Credit [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Negative covenant ratio	4.25
L Catterton [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Gross purchase amount on equity securities (at least)	$ 18,500,000
Scenario, Forecast [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum leverage ratio			4.75	5.00		5.25
Minimum fixed charge leverage ratio					1.25